#include <fstream>
#define NMAX 5004
#define GMAX 10002

using namespace std;
ifstream fin("rucsac.in");
ofstream fout("rucsac.out");

int n, G;
int g[NMAX];
int c[NMAX];
int cmax[GMAX];

void citire();
void pd();

int main()
{
    citire();
    pd();
    fout<<cmax[G]<<'\n';
    fout.close();
    return 0;
}

void citire()
{
 int i;
 fin>>n>>G;
 for (i=1; i<=n; i++)
     fin>>g[i]>>c[i];
}

void pd()
{
    int i, x;
    for (i=1; i<=n; i++)
        for (x=G; x>0; x--)
            if (x>=g[i])
               if (cmax[x]<c[i]+cmax[x-g[i]])
                   cmax[x]=c[i]+cmax[x-g[i]];
}